Compilare: user.cpp: In function ‘void solve()’: user.cpp:59:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); i++) ^ user.cpp:61:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pos; i < sol.size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:25:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:27:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a[i].x, &a[i].y); ^ user.cpp: In function ‘int main()’: user.cpp:69:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mission.in", "r", stdin); ^ user.cpp:70:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mission.out", "w", stdout); ^ user.cpp: In function ‘void solve()’: user.cpp:63:5: warning: ‘pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = 0; i < pos; i++) ^